The original mass of the sample is 15g
t = 2.303/k × log a/ a-z
k = rate constant = 0.0198 days–1
t = time passed by the sample = 98.3 days
a - x = amount left after decay process = 2.14
t = 2.303/k × log a/ a-z
the original mass of the sample a = 15g
The mass of a sample of a chemical compound is divided by the quantity of that substance, or the number of moles in the sample, measured in moles, to obtain the compound's molar mass in chemistry. In contrast to molecular properties, a substance's molar mass is a bulk property. The compound. is present in many different. forms, each with a different mass as a result of the isotopes. The molar mass represents the average of these masses. The molar mass is most frequently calculated from the standard atomic weights and is a function of the relative abundance of the constituent atoms' isotopes on Earth. It is thus a terrestrial average.
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Consider the following unbalanced equation. What is the standard free energy for the reaction of 7. 2 moles of al2o3(s) at 298k?.
for the following unbalanced equation.5800 kj is the standard free energy for the reaction of 7. 2 moles of al2o3(s) at 298k
First, let's balance the equation. Both sides must have the same amount of each element, so: Al₂O(s) + 3CO(g) 2Al(s) + 3CO2(g)
The free energy can be calculated by: AG = AH-TAS Where AH is the enthalpy of the reaction, and AS is the entropy of the reaction.
Al2O3(s): Hf=-1676.0 kJ/mol; S = 50.92 J/mol.K Al(s): Hf = 0.00; S° = 28.3 J/mol.K
CO(g): Hf=-110.5 kJ/mol; S = 197.6 J/mol.K
CO2(g): Hf=-393.5 kJ/mol; S = 213.6 J/mol.K
AH = Σn*Hf products - En*Hf reactants (n is the coefficient of the compound).
AH = (3*(-393.5) + 2*0) - (3*(-110.5) + (-1676)) = 827KJ
AS = {n*S* products - Σn*S° reactants
AS = (3*213.6 +2*28.3) - (3*197.6 + 50.92) = 53.68J/K = 0.05368 kJ/K
AG 827-298*0.05368 AG = 811 KJ
Which is the free energy for 1 mol of Al2O3
1 mol of Al2O3=811 KJ X 7.2 moles of Al2O3
By a simple direct three rule: standard free energy is x = 5839.2 kJ = 5800 kJ
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how does knowing the states of matter help to explain any difference in mass from the reactants to the products?
The process is a change of state, dissolving, or a chemical reaction, the total mass of the substances does not change.
French chemist Antoine Lavoisier established the law of conservation of mass in 1789. According to the rule of conservation of mass, a chemical process cannot generate or destroy matter.
For instance, when wood burns, the mass of the gases, soot, and ashes is equal to the amount of the charcoal and oxygen before the reaction began. Thus, the mass of the reactant and the mass of the product are equal. A product is the material created as a result of a chemical reaction, whereas a reactant is the chemical reaction of two or more elements to create a new substance. Although matter and the associated mass cannot be generated or destroyed, they can change into other substances such as liquids, gases, and solids.
Hence, the process is a change of state, dissolving, or a chemical reaction, the total mass of the substances does not change.
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Calculate the normal boiling point of chloroform given that the standard enthalpy of vaporization of chloroform is 31. 4 kj/mol and the standard entropy of chloroform is 93. 7 j/mol·k.
chloroform has a standard energy of vaporization of 31. 4 kJ/mol and a standard entropy of 93. 7 j/mol/K, the standard enthalpy of vaporization chloroform is 335K.
How is the boiling point of vaporization entropy calculated?Set the Gibbs free energy of vaporization delta G = delta H minus T delta S = 0 if the enthalpy of vaporization delta H and the entropy of vaporization delta S are known (for a large number of substances, they are available in tables). The boiling point's temperature is thus given by T = delta H/delta S.
How is the boiling point determined?The Boiling Point Formula Kb is frequently calculated using the formula Kb = RTb2M/Hv, where R is the universal gas constant. Tb is the pure solvent's boiling point (measured in K), and M is the solvent's molar mass.
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ammonia chemically reacts with oxygen gas to produce nitric oxide and water . what mass of nitric oxide is produced by the reaction of 1.37g of oxygen gas?
Nitric oxide weighs 0.77 grams and is created by the reaction of 1.37 grams of ammonia.
What does oxygen contain?Chemical elements, like oxygen, are compounds that only have one type of atom. An oxygen atom has 8 protons through its nucleus, which is why it has an electron density of eight and the chemical symbol O. At ambient temperatures, oxygen is a colorless, odorless gas.
The equation for the reaction of ammonia and oxygen to produce Nitric oxide and water is,
4NH₃ + 5O₂ → 4NO + 6H₂O
From the reaction we can see,
4 moles of ammonia = 4 moles of nitrix oxide.
Mole of ammonia = moles of nitric oxide.
Moles = reacted/formed mass/ molar mass
Molar mass of ammonia = 17 g/mol.
Molar mass of nitric oxide = 30 g/mol.
Mass of ammonia reacted = 1.37 grams.
Putting values,
1.37 x 17 = Formed mass of nitric oxide x 30
Formed mass of nitric oxide = 0.77 grams.
The mass of nitric oxide formed is 0.77 grams.
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Draw the curved arrow mechanism for this reaction, including the carbocation rearrangement step. Show all nonbonding electrons and all formal charges explicitly. (1) Draw the curved arrow mechanism for step 1.
□>⊂Q, ∘
10
H− Cू
¨
i
I
Well here i can't draw the diagram for the curved arrow mechanism for the given reaction including the carbocation rearrangement step.
Brief descriptions of:What is carbocation?Carbocation is simply the positively (+ivly) charged carbon ions.
Examples of carbocation are:
Methenium CH⁺ ₃, Methanium CH⁺ ₅ vinyl C ₂H⁺ ₃Curved arrow mechanism:Curved arrow mechanism are the mechanism in which to represent electron flow instead of linear arrow, curved arrows are used. The origination of the electron is indicated by the tail of the curved arrow. The movement of two electrons is represented by double barbed arrow.
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based on the change in color of the solution, how does the addition of ammonia cause the value of δ o to change for the nickel complex?
When ammonia is initially added to a solution containing Ni2+, solid nickel hydroxide, Ni(OH)2 is formed.
Ni2+ (aq) + 2 NH3 (aq) + 2 H2O (aq) → Ni(OH)2 (s) + 2 NH+4 (aq)
If more ammonia is added or if excess ammonia is now present in solution, Ni(OH)2 will be dissolved due to the formation of a violet-colored complex, [Ni(NH3)6]2+.
Ni(OH)2 (s) +6 NH3 (aq) → [Ni(NH3)6]2+ (aq)
The color of the solution is violet due to the formation of the nickel complex, hexaamminenickel(II).
What is Complex Compounds?
Coordination or Complex Compounds are addition compounds that are stable in a solid state. They are able to retain their identity even in solution. The central metal ion forms dative or coordinate bond with the ligands, which are species that surround the metal.
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the metabolite 11 nor tetrahydrocannabinol 9 cooh can be detected by immunoassay 3-5 days after a single use of ____
The metabolite 11 nor tetrahydrocannabinol 9 COOH can be detected by immunoassay 3-5 days after a single use of marijuana.
The use of an antibody or an antigen as a biorecognition agent allows for the highly selective bioanalytical technique known as an immunoassay to detect the presence or concentration of analytes ranging in size from small molecules to macromolecules in a solution.
Immunoassay assays are biochemical procedures that use the antigen-antibody response theory to diagnose illness. It seeks to determine both an analyte's concentration and presence. Immunoassay testing is used by scientists and medical practitioners to find various antibodies Metabolite 11 nor tetrahydrocannabinol 9 COOH is also identified by this.
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an aqueous ethanol solution (400 ml) was diluted to 4.00 l, giving a concentration of 0.0400 m. the concentration of the original solution was m. question 29 options: 4.00 2.00 1.60 0.400 0.200
An aqueous ethanol solution (400 mL) was diluted to 4.00 L, giving a concentration of 0.0400 M. The concentration of the original solution was 0.400 M.
Given:
ethanol solution V₁ = 400 ml
concentration M₂ = 0.0400 M
volume of diluted ethanol V₂ = 4.00 L = 4000 ml
concentration of original solution = M₁ = ?
Formula used:
Dilution is the process of decreasing the concentration of a solute in a solution, usually simply by mixing with more solvent like adding more water to the solution.
in this case, we need to use the dilution formula
M₁V1 = M₂V₂
M₁ = initial molarity
v1 = initial volume in liters
M₂ = final molarity
V₂ = final volume in liters
Solution:
using the dilution formula:
M1 × 400 = 0.04 × 4000
M1 =[tex]\frac{0.04 * 4000 }{400}[/tex]
= 0.400 M
Hence 0.400 M is a correct answer.
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when an alkene is subjected to treatment with hg(oac)2 in ch3oh followed by reaction with nabh4, what new class of compound is formed?
An alcohol is created when an alkene undergoes treatment with hg(oac)2 in ch3oh, followed by a reaction with nabh4.
What are the uses of alkene?
Introduction. One of the most adaptable chemical building blocks, alkenes are essential to numerous synthetic reactions. Alkene reactants are used in hydrofunctionalization processes such olefin hydroalkoxylation and hydroamination, which is a very active area of catalysis.
Alkene vs. alkane: what are they?
Alkanes are saturated hydrocarbons because they only have one bond between the carbon atoms. Alkenes have at least one double bond between carbon atoms. Alkynes have one or more triple bonds between carbon atoms. Unsaturated hydrocarbons are the name given to alkenes and alkynes.
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Classify each of the substances as an electrolyte or a nonelectrolyte. Electrolyte Nonelectrolyte Answer Bank sodium hydroxide, NaOH potassium iodide, KI most molecular solutes methanol, CH OH a substance that forms an aqueous solution which does nol conduct eloctricity table sugar a soluble ionic compound sodium chloride, NaC
From the substances given, we can classify them as an electrolyte or a non-electrolyte as stated below:
Electrolyte:
NaOH (sodium hydroxide)KI (potassium iodide)NaCl (sodium chloride)A soluble ionic compoundNon-electrolyte:
Most molecular solutesCH3OH (methanol)Table sugarA substance that forms an aqueous solution but does not conduct electricity.What are electrolytes and non-electrolytes?Electrolytes are some substances that can release electrical charges in the form of cations (positive charge) and anions (negative charge). These electrical charges move freely in the aqueous form as a soluble ionic solution. The freely-moving molecules can conduct electricity. On the other hand, non-electrolytes do not contain anions and cations. Hence, they cannot conduct electricity.
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explain how can the periodic table be used to predict how many electrons a certain metal atom loses to form an ion in an ionic compound? provide two examples.
Predict how many electrons a certain metal atom loses to form an ion in an ionic compound we use the column that they are in to know how many valence electrons they have.
What kinds of metal are there?Ferrous metals, which include iron, and non-ferrous metals, which do not, are the two basic categories into which metals can be separated. Pure iron is too soft and ductile to be much use as just an engineering material.
Which are the 20 metal elements?Lithium, Beryllium, Sodium, Mg, Aluminum, Potassium, & Calcium are the metals within the first twenty elements. The first 20 elements' non-metals are currently Hydrogen, Helium, Carbo, Nitrogen, Oxygen, Fluorine, and Carbon.
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how does the reaction rate change when the nitrogen monoxide concentration is doubled and chlorine concentration is halved? defined term
When the concentration of nitrogen monoxide is doubled and the concentration of chlorine is cut in half, the reaction is second order in nitrogen monoxide, NO.
Is NOx equivalent to NO2?
Nitric oxide (NO), an odorless, colorless gas, and nitrogen dioxide (NO2), a reddish-brown gas with an offensive odor, are the two gases that are typically referred to as "nitrogen oxides" (NOx). Nitrogen dioxide is created when nitric oxide combines with oxygen or ozone in the atmosphere.
N2O is a laughing gas, right?
A non-flammable, colorless, and odorless gas is nitrous oxide. Despite not being flammable, nitrous oxide will nonetheless facilitate combustion to the same degree as oxygen. It produces a mood of exhilaration, therefore the moniker "laughing gas." The least effective inhalational anesthetic is nitrous oxide.
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a solid mixture contains mgcl2 and nacl. when 0.500 g of this mixture is dissolved in enough water to form 1.00 l of solution, the osmotic pressure at 25 °c is found to be 0.390 atm. what is the mass percent of mgcl2 in the mixture?
The mass percent of mgcl2 in the mixture is 50.3%, a solid mixture contains mgcl2 and nacl. when 0.500 g of this mixture is dissolved in enough water to form 1.00 l of solution is 0.4033.
What is osmotic pressure?
The highest pressure that can form in a solution when it is isolated from a solvent by a membrane that is permeable solely to the solvent. Osmosis pressure is dependent on molar concentration and absolute temperature.
What is mass?
A substance or object's mass is a measurement of how much matter there is in it. Smaller masses can be measured in grams instead of kilograms (kg), which is the standard SI unit for mass (g).
Given, mass of mixture= 0.5000
Osmatic pressure of solution = 0.3950
Nacl and mgcl2 are strong electrolyte and completely dissociate.
hence, vant roff factor for Nacl =2
vant roff factor for mgcl2= 3
let amount of Nacl= xgm
amount of Mgcl2= (0.500-x) gm
o.p. for Nacl= i * wt. of substance * l T/ mol. wt. * vol. of sol in litre
= 2*x*0.0021*290/50.5*1
=0.0364x
o.p. for Mgcl2 = 3* (0.500-x) * 0.0021* 29.0/95*1
=0.7725x
o.p. of solution = 0.3950 atm ( given)
Then,
0.3950= 0.364x+ 0.7725x
0.3950= 1.6009x
0.3950/ 1.6009 = x = 0.2455gx
mass of Nacl2= 0.2455gx
mass of Mgcl2 = 0.5000- 0.2455
= 0.2545gx
% mass of Mgcl2 = mass of Mgcl2/ total mass
=0.2545/0.5000 *100
=50.3%
vapor pressure of pure A= 350 torr
vapor pressure of pure B = 100 torr
let mole fraction of A= x
let mole fraction of B = (1-x)
vapor pressure of solution as equilibrium = 2* mole fraction of A
= 2x
Now according to raoults law
Pa = Pa*mf of A
Pb = Pb* mf of B
vapour pressure of a solution
(Pa+Pb) = (Pa*mf of A) + (Pb* mf of B)
= 2x= (350*x)+100x (1-x)
2x= 350x+100-100x
2x=250x+100
248x= 10
x= 100/248
x= 0.4032
x=0.4033
Therefore, mass percent of mgcl2 in the mixture is 50.3%, a solid mixture contains mgcl2 and nacl. when 0.500 g of this mixture is dissolved in enough water to form 1.00 l of solution is 0.4033.
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.
samples g-l all contain calcite. what property of calcite would assist you in identifying these samples?
would be to identify calcite by use of double refraction. Light splits into two rays and undergoes twofold refraction when it passes through calcite. We can recognize calcite by these.
Marble and limestone are primarily composed of calcite. The Earth's crust is largely composed of these extremely common rocks. They are one of the world's largest carbon storage areas. Calcite is one of the most often utilized minerals due to its unique features. Although calcite reacts with HCl impressively, the main application of this reaction in the field is to distinguish between limestone and dolostone. My recommendation is to identify calcite by use of double refraction. When light travels through calcite, it is refracted twice.
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Which serum value is a reflection of the effectiveness of the kidney’s ability to properly maintain serum metabolic ph?.
The efficacy of the kidney's capacity to correctly maintain the serum metabolic pH is reflected in the serum bicarbonate (HCO3-).
What does serum bicarbonate (HCO3-) mean?
Serum bicarbonate (HCO3-) is a measurement of the amount of bicarbonate ions in blood, which aid in controlling blood pH. It is normally assessed as part of a standard blood test and is used as an indicator of acid-base balance. Dehydration, renal or liver illness, metabolic acidosis, and other medical problems can all be indicated by abnormal serum bicarbonate levels.
What is Serum metabolic ph?
A measurement of the blood's acidity or alkalinity is the serum metabolic pH. It is usually assessed as a component of a thorough metabolic panel, a kind of blood test. The range of the serum metabolic pH normal values is 7.35 to 7.45.
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A solution contains one or more of the following ions: ag+, ba2+, and cu2+. When you add sodium chloride to the solution, no precipitate forms. When you add sodium sulfate to the solution, a white precipitate forms. You filter off the precipitate and add sodium carbonate to the remaining solution, producing another precipitate.
Net ionic equations for the formation of each of the precipitates observed:
Cl⁻ + Ag⁺ → ClAg ↓
CO₃⁻² + Ca²⁺ → CaCO₃ ↓
CO₃⁻² + Cu²⁺ → CuCO₃ ↓
What is precipitation?
Precipitation is the process of changing a dissolved substance from a supersaturated solution to an insoluble solid in an aqueous solution. Precipitate refers to the produced solid.The chemical agent that initiates the precipitation in an inorganic chemical process is known as the precipitant.The term "supernatant" or "supernatant" also refers to the clear liquid that remains on top of the precipitated or centrifuged solid phase.When solid impurities separate from a solid phase, the concept of precipitation can also be applied to other areas of chemistry, such as organic chemistry and biochemistry, as well as the solid phases (such as metallurgy and alloys).To know more about precipitation in chemical equations, click the link given below:
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What is the answer i will give brainllest
Answer:
the answer is double replacement
How does a balanced chemical equation demonstrate the Law of Conservation of Mass?
(1 point)
A. It shows that all compounds remain bonded after the reaction
B. It shows that no atoms have been gained or lost during the reaction
C. It shows that the properties of the elements stay the same after the reaction
D. It shows that only physical changes follow the Law of Conservation of Mass
Thank you If you help!
cpmpute the composition of the iron carbon alloy for which the mass fraction of total ferrite and total cementite are 0.88 and 0.12 what is the protectoid phase
In this problem we are given values of Wα and WFe3C for an iron-carbon alloy (0.88 and 0.12,respectively), and then are asked to specify whether the alloy is hypoeutectoid or hypereutectoid.
Employment of the lever rule for total α leads to
W[tex]\alpha[/tex] = 0.88 = [tex]\frac{CFe3C- C0}{CFe3C - \alpha }[/tex] = [tex]\frac{6.70 -C0}{6.70- 0.022}[/tex]
Now, solving for C0, the alloy composition, leads to C0 = 0.82 wt% C. Therefore, the alloy is hypereutectoid since C0 is greater than 0.76 wt% C.
What is the protectoid phase?
The term proeutectoid refers to a phase that develops (on cooling) before eutectoid austenite decomposes. It is similar to primary solids in that it is the first phase to solidify after the austenite phase has solidified.
How do you find the Proeutectoid phase?
On a phase diagram, the proeutectic point is the temperature at which the mixture transforms into a mixture of two solids. There are two proeutectic temperatures. One happens at 1587°C, where everything over this temperature is liquid.
Hence above given is a correct answer.
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one mole of an ideal gas does 2900 j of work on its surroundings as it expands isothermally to a final pressure of 1.00 atm and volume of 25.0 l. (a) determine the initial volume.
The one mole of an ideal gas does 2900J of work on surroundings as it expands isothermally. The initial volume of a gas is 8.0 L.
FIrst find out the temperature of a gas using ideal gas law which is
PV=nRT
For ideal gas, n=1 and R=0.08206 Latm/molK, V=25.0L, P=1atm
Rearrange the formula for T
T=PV/nR
Plug all values in the formula
T=(1.00atm×25.0L×molK/1mol×0.08206Latm)
T=25.00 K/0.08206
T=304.65K
The work done for isothermal condition is calculated as
W=2.303nRTlog(V₂/V₁)
Where V₂=25.0L, R=8.314 J/molK, n=1 mol, T=304.65K, V₁=?, W=2900J
Plug all values in the formula
2900J=2.303×1mol×(8.314J/molK)×304.65K×log(25/V₁)
2900J=5833.1768J×log(25/V₁)
log(25/V₁)=(2900 J/5833.1768 J)
log(25/V₁)=0.49716
Take antilog on both side
25/V₁=10^0.49716
25/V₁=3.14167
V₁=(25/3.14167)
V₁=7.95755 L
V₁=8.0 L
Therefore, the initial volume of a gas is 8.0 L.
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what kind of intermolecular forces act between a chloramine (nh2cl) molecule and a potassium cation?
The intermolecular forces act between a chloramine (nh2cl) molecule and a potassium cation is Dipole to Dipole bonding.
What is an example of a dipole-dipole interaction?
A dipole-dipole interaction can occur between polar molecules such as hydrogen chloride (HCl), carboxylic acids (i.e., acetic acid), and amino acids. The positive end of a polar molecule will attract the negative end of the other molecule and alter its location.
What is Dipole to Dipole bonding?
Dipole to Dipole force arise when atoms with partial charges within a molecule attract another atom with an opposite partial charge that is located around the molecule.
Therefore,
Because chloroamine and water are both polar solvents, hydrogen bonds, dispersion forces, and dipole-dipole forces of attration exist between them. Water molecules form hydrogen bonds.
Hence Dipole to Dipole bonding is a correct answer.
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How do changes in the sequence of DNA affect traits
which d electron count can exhibit both high-spin and low-spin states in an octahedral complex? d3 d8 d5
d electron count can exhibit both high-spin and low-spin states in an octahedral complex is d⁶
high spin complex is a complex ion with more unpaired electrons in the d orbitals of the central atom. These ions are known to be paramagnetic.
low spin complex ion is a complex known to have electron pairs at low energy levels.
High-spin and low-spin complexes are characterized based on their magnetic moments.
If the configuration of the complex has an unpaired electron, it is said to be a high-spin complex. If the unpaired electron is missing, the complex is called low-spin.
There are two types of ligands approaching the central metal ion: strong electric fields and weak electric fields. In both cases, the d-orbital splitting is different. In case of strong electric field Δ>P
For weak electric field Δ
where Δ is the crystal field splitting
When. P is the pairing energy
Only d⁶ type electron configurations can display both High Spin (HS) and Low Spin (LS).
d⁶(strong)= t₂⁶g gives LS
d⁶(weak)= t₂⁴g eg³ gives HS
Therefore, only the d 6 electron configuration can give rise to both LS and HS complexes in the presence of strong and weak ligand fields, respectively.
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the bronsted-lowry definition of a base is: group of answer choices produces h⁺ in solution. produces oh⁻ in solution. a proton donor. a proton acceptor. none of the above
A collection of answer options that results in h+ in the solution is the bronsted-lowry definition of a base. a proton acceptor that generates oh in a solution. bronstted - lowry Acid and base definition.
Proton donation is carried out by acid. Base is a material that can take in protons. So, based on the foregoing Definition, option B is right. A base, which is the complementary particle to an acid, is also known as a proton acceptor. A base, according to the Broensted-Lowry definition, is a negatively charged ion that can react with or receive a positively charged hydrogen ion. Any hydrogen-containing material that has the ability to give another substance a proton (hydrogen ion) is considered an acid. An entity that can accept a hydrogen ion is known as a base.
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Order these compounds in order of increasing carbon-carbon bond strength and in order of decreasing carbon-carbon bond length : HCCH, H_2CCH_2, H_3CCH_3.HCCH,H 2
CCH 2
,H 3
CCH 3
.
The increasing order of carbon-carbon bond strength is H_3CCH_3<H_2CCH_2< HCCH and the decreasing order of carbon-carbon bond length is H_3CCH_3 > H_2CCH_2 > HCCH.
What is Bond Order?The number of chemical bond between pair of atoms is termed as its Bond order.
For Example,
HCCH i.e. H−C≡C−H has three pairs of bond hence its bond order is 3.
Bond Length:The distance between the centers of two covalently bonded atoms is known as its Bond length.
The Increasing order of bond length is generally the :
3 bond < 2 bond < 1 bond.
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What is the concentration of H+ ions at a pH = 7?
mol/L
What is the concentration of OH ions at a pH = 7?
mol/L
What is the ratio of H* ions to OH ions at a pH = 7?
Answer:10-5mol/l
In the same way, a solution with a pH of 5 contains 10-5mol/l of hydrogen ions, a solution with a pH of 6 contains 10-6mol/l of hydrogen ions, while the solution with a pH of 7 contains 10-7mol/l of hydrogen ions.
Explanation:
elect all that apply Which of the following couples are buffer systems? (a) KF/HF(b) KBr/HBr(c) Na^CO3/NaHCO3 A. KF/HF B. KBr/HBr □ C. Na2CO3/NaHCO3 □ D. none
Of the following given compound or couples KF/HF, Na^CO3/NaHCO3 are the buffer systems as they consist of both weak base or acid.
What is buffer systems?Buffer systems is the acid-base homeostatic mechanism. It is helpful in maintaing the pH in blood by balancing the carbonic acid, bicarbonate ion, and carbon dioxide .
Formation of buffer systems:Buffer systems are made of weak Base-acid mixed with its conjugate base-acid dissolved in water. The conjugate acid-base should be from its Salt.
Hence, Of the following given compound or couples KF/HF, Na^CO3/NaHCO3 are the buffer systems as they consist of both weak base or acid.
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An unknown substance has a mass of 16.9 g . When the substance absorbs 1.521×102 J of heat, the temperature of the substance is raised from 25.0 ∘C to 45.0 ∘C . What is the most likely identity of the substance?
Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, the specific heat and identity of the sample is +0.89 J/g°C and aluminum respectively.
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.
Mathematically,
Enthalpy=mass of unknown metal× specific heat capacity of unknown metal× Change in temperature
mass of unknown metal=16.9 grams
specific heat capacity of unknown metal=?
Change in temperature=final temperature - initial temperature
=318-298.7
= 20K
enthalpy=1.521×10²J
Substituting all the given values in the above equation, we get
1.521×10² =16.9 × specific heat capacity of unknown metal×20
3510 =3,910.68× specific heat capacity of unknown metal
specific heat capacity of unknown metal=-0.89J/g°C
Therefore, the specific heat and identity of the sample is +0.89 J/g°C and aluminum respectively.
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use the ionic bonding model to determine which has the higher melting point, rbcl or sro . explain your answer.
The smaller charges of the ions cause RbCl to have a higher melting point.
Which ionic compound has the highest melting point How do you know?
I The Ion Charge
In general, the higher the melting point, the stronger the ionic bond, the stronger the electrostatic attraction, and the higher the charge.
Why are ionic solids more flammable than covalent solids?
In ionic compounds, a strong electrostatic force holds the cation and anions together. The link that holds particles together and the attractive force that pulls them apart is known as the electrostatic force. The high melting point is a result of how challenging it is to separate the particles from one another.
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the electrons in the ________ links remain located between two atoms. electrons in ________ bonds can be relocated between more than two atoms.
the electrons in the chemical bond links remain located between two atoms. electrons in covalent bonds can be relocated between more than two atoms.
What are covalent bond ?The most significant type of bonding in organic chemistry is covalent bonding. Atoms sharing some electrons leads to the creation of a covalent bond. Two atomic orbitals touching one other form the bond [1]. Figures 3-4 depict this procedure. Each shared electron in this kind of relationship counts toward the valence shells of both atoms in order to meet the octet rule. Each atom contributes one electron to a pair of electrons that are shared in a single bond. Three pairs of electrons are shared by triple bonds, while two pairs are shared by double bonds. Several covalent bonds are bonds that share multiple electron pairs.
What is chemical bond ?Chemical bonds are formed when the atoms in a compound's molecule are brought together and kept together by a powerful combining force. Ionic and covalent bonds are the two different types of chemical bonds.
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